Originally Posted By: Turbo-6
Snowman,
If your WOT mixture is correct then measure the 73 jet with a drill to get diameter, then measure the PVCR dia. figure both areas add together to get total area.
Take about a 66 jet and figure that area, subtract from total to get area to drill out PVCR, install a 2.5 power valve.
Turn in idle mix screws all the way in then out 1 to 1.5 turns. Set floats so gas drips out at idle.
Set pump shot so there is a little pressure on the diaphram.


All of what you said sounds right on but why did you chose a 2.5" power valve? Seems really low. Or is that because you don't want all of the extra fuel coming in from the drilled PVCR coming in until you're almost at boost?

Last edited by snowman4839; 10/28/11 01:22 AM.
69 Buick Special Deluxe. Intercooled Turbo Chevy 250 @ 15psi on a stock long block. It's kinda fast.